[Letux-kernel] Timers (was Re: [PATCH 00/20] A bunch of JZ4730 fixups for letux-kernel)

[H. Nikolaus Schaller]

> Am 19.01.2021 um 15:55 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> 
>> Am 19.01.2021 um 13:35 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>> 
>> 
>> Only sysbench still gets stuck (or runs forever - or at least more than 50 minutes).
> 
> I aborted after 183 minutes...
> The top command did say something around 90% processor load.
> 
> What I would accept is that it runs something between 10% and 30% of the AM3358.
> This did need 359.8562 seconds, i.e. 10 minutes. So 30 - 100 minutes would have been ok.
> But not 183.
> 
> So the CPU or user-space commands are running pretty slow.
> 
> But: what I was now able is to start X11. Also very very slow. But works!
> 
> Reaction to mouse events is sluggish, but generally works. I only see this:
> 
> (EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
> (EE) 
> (EE) Backtrace:
> (EE) 0: /usr/bin/X (xorg_backtrace+0x84) [0x557847c4]
> (EE) 
> (EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
> (EE) [mi] mieq is *NOT* the cause.  It is a victim.
> 
> /proc/interrupts did not show anything problematic. Even:
> 
> root at letux:~# fgrep TCU /proc/interrupts && sleep 10 && fgrep TCU /proc/interrupts
>  8:     830167       TCU   0  TCU0
>  8:     831204       TCU   0  TCU0
> root at letux:~# top
> 
> shows that there are just 100 interrupts per second.
> 
> Hm. Is the cache not working at all? Can we test that?

After a while X11 became faster. Strange.

What I also noticed is that lsusb is very slow. 2 seconds:

root at letux:~# time lsusb
Bus 001 Device 004: ID 0ace:1215 ZyDAS ZD1211B 802.11g
Bus 001 Device 003: ID 0a81:0205 Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter
Bus 001 Device 002: ID 058f:9254 Alcor Micro Corp. Hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

real    0m1.980s
user    0m1.891s
sys     0m0.077s
root at letux:~#

This may be a similar issue with the CI20 which hangs after a while
(heartbeat LED stops blinking). Maybe an IDLE issue? or Cache...

BR,
Nikolaus